Image-taking apparatus and method for controlling the same
a technology of image-taking apparatus and control method, which is applied in the direction of color signal processing circuit, color television details, television system, etc., can solve the problems of loss of color balance, inability to set maximum gain value, and inability to appropriately set determination reference valu
Active Publication Date: 2013-08-01
CANON KK
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Benefits of technology
The patent text describes a method to switch between color and monochrome modes based on the maximum gain value. The method optimizes the switching performance regardless of the maximum gain value settings. The technical effect of this method is improved switching between color and monochrome modes based on the maximum gain value.
Problems solved by technology
When the light beam in the near-infrared region is passed through the optical path, however, a color balance is lost.
However, in the configuration of the image-taking apparatus discussed in Japanese Patent Application Laid-Open No. 2010-279061, a maximum gain value cannot be set.
On the other hand, in the camera having a function of setting a maximum gain value that has attracted a demand from a user in recent years, a determination reference value is not appropriately set in response to an output change according to the setting of the maximum gain value.
Therefore, a mode switching cannot be correctly performed.
Method used
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[0023]Various exemplary embodiments, features, and aspects of the disclosure will be described in detail below with reference to the drawings.
[0024]A case where a camera is used as an image-taking apparatus will be described below.
[0025]FIG. 1 illustrates a configuration of a camera according to a first exemplary embodiment of the present disclosure.
[0026]The camera includes an image data generation unit 101 configured to receive light from outside the camera to generate image data. The image data generation unit 101 includes an imaging unit 102 and an image signal processing unit 103 configured to subject a signal obtained from the imaging unit 102 to predetermined processing.
[0027]The camera includes an imaging mode switching unit 104 configured to switch image data to a monochrome image or a color image, and a switching evaluation value calculation unit 105 configured to calculate an evaluation value based on an output from the imaging unit 102. Further, the camera includes a max...
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An image-taking apparatus changes a switching threshold value for switching between a color mode and a monochrome mode according to a maximum gain value set by a maximum gain setting unit so that switching between the color and monochrome modes can be optimally performed regardless of setting of the maximum gain value. The image-taking apparatus includes a threshold value correction unit configured to correct the switching threshold value according to the maximum gain value. The threshold value correction unit sets the switching threshold value with the maximum gain value set larger than an initial value to be smaller than the switching threshold value with the maximum gain value set smaller than the initial value.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present disclosure generally relates to an image-taking apparatus and a control method therefor and, more particularly, to those capable of appropriately switching an image output mode when a maximum gain value is set.[0003]2. Description of the Related Art[0004]A human color vision characteristic serving as a sensitivity to a color and a human luminous efficiency characteristic serving as a sensitivity to brightness fall within a range from 380 nm to 780 nm, which is referred to as a visible range. Humans have little sensitivity in a longer wavelength range than 700 nm. Generally in an image-taking apparatus, an infrared ray cut filter (IRCF) for visibility correction, which does not pass a light beam in a near-infrared region, is provided ahead of an image-pickup sensor so that color reproducibility can match the human color vision characteristic.[0005]However, under low illumination at which a subject luminance d...
Claims
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IPC IPC(8): H04N9/68H04N23/12H04N23/76
CPCH04N5/23245H04N9/68H04N5/2351H04N23/667H04N23/71
Inventor NAKATA, TAKAMICHIKOGURE, KENTARO
Owner CANON KK